The equivalent circuit of a powder electroluminescent capacitor
The equivalent circuit of a powder electroluminescent capacitor
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粉末电致发光电容器的等效电路
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
K. S. Enikeeva
中科院分区：
文献类型：
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作者：
K. S. Enikeeva
本文提出并分析了在绝缘体中填充粉末状ZnS电致发光材料的电容器的等效电路。本文阐述了样品在黑暗中和紫外光照射下介电特性的基本规律：暗频率最大值tg δ和相应的电容色散C的存在和性质，以及在紫外光照射下出现的某些新的最大值tg δ及其性质。tg δ的暗极大值归因于第二相的电导率，而亮极大值归因于非均匀晶粒的光电导。本文还考虑了样品在紫外光照射下可能出现的Δtgδ和Δ tg ″负变化的情况。文献[1]研究了ZnS荧光粉均匀分布在碲化锌薄膜中的介电性能。测量是在弱场中进行的，此时与电致发光相关的过程不会出现。与磷光体不同，在大多数ZnS样品中，在黑暗中发现tg δ的频率最大值，在其区域内电容分散。这些光最大值的频率（ω）随紫外光强度的增加而增加，并在切断激发后随时间的推移而减小。红外线照射使光的最大值沿频率轴向左沿着移动，对tg δ的暗的最大值完全没有影响。在[1]中示出，该暗最大值由第二相的电导率控制，并且光最大值由磷光体的天然颗粒中的不均匀光电导性控制。在某些样品中，第二相的电导率随温度而增加，而在另一些样品中，第二相的电导率不变。基于[2]，得出结论，这与不同含量的超化学计量颗粒有关。
An electrical equivalent circuit is proposed and analyzed for capacitors filled with powdered ZnS electroluminescent phosphor in the insulator. The basic laws of the behavior of the dielectric characteristics of the specimen in the dark and when illuminated by ultraviolet (UV) light are explained: the existence and properties of a dark frequency maximum of tg δ and the corresponding dispersion of capacitance C as well as the appearance of certain new maxima tg δ with UV illumination and their properties. The dark maximum of tg δ is ascribed to the conductivity of the second phase and the light ones to the photoconductivity of the nonuniform grains. The case of possible negative changes in Δtgδ and Δɛ″ when the specimen is illuminated by UV light is also considered.A study was made in [1] of the dielectric properties of ZnS phosphor uniformly distributed in a teflon film. Measurements were carried out in weak fields when the processes associated with electroluminescence do not appear. As distinct from photophosphors, a frequency maximum of tg δ was found in the majority of specimens of ZnS in the dark, with a dispersion of capacitance in its region. The frequency of these photo-maxima (ω) increased with increase in the intensity of UV illumination, and decreased with the lapse of time after cutting off the excitation. Infrared illumination shifts the light maxima to the left along the frequency axis and does not affect the dark maximum of tg δ at all. It is shown in [1] that this dark maximum is governed by the conductivity of the second phase, and the light maxima by the nonuniform photoconductivity in the natural grains of the phosphor. In certain specimens the conductivity of the second phase increases with temperature and in others it is unchanged. Based on [2], it was concluded that this is connected with differing content of extra-stoichiometric granules.